How can I understand that e-mail under my domain is not validated?
In your personal account the domain has "E-mail not validated" status, which can be viewed:
- in "Review and update data on services" section (in "Operations" menu),
- in "Domains" section (in "Active Services" menu),
- On a domain page ("Active Services" menu → "Domains" → domain link).
If no e-mail under domain is validated, whois contact (Registrant type) will also have "E-mail not validated" status.